How to uninstall an Arduino touchscreen board?

I installed an Arduino touchscreen development board that lists a LVGL
version that was wrong.

So, I fixed the LVGL version and have attempted many times to remove the previous
board and copy the new board into the correct Arduino folder.

However, SquareLine Studio keeps remembering the previous board install no matter what I try.

I finally gave up and installed Squareline Studio on another PC of mine with the
good Arduino board and everything works.

Question: How do I COMPLTELY REMOVE the old Arduino board from Squareline
Studio so I can install the correct Arduino board on my main laptop PC?

Squareline Studio v1.4.2

Hi,

SquareLine Studio stores boards in the directory C:\Users\USERNAME\SquareLine\boards. If you are making a custom board file, create a new folder, copy the modified Arduino folder, then rename the folder so that it does not appear twice. then rename the png and slb files in the app to the same as the folder. so the board will appear separately on the launch screen and will not be overwritten during a board update